help regarding my windows xp home install on dell inspiron 1501 HELP ME!

right here goes,basically ive re-installed windows xp on the laptop and asking for my COA which is on the laptop.I+ have entered it numerous times but saying unathorized for some strange reason.Contacted windows they say contact dell,then dell said contact windows im going round and round in circles can anyone help?

I'm assuming you're not using the restore disc that came with the laptop, as that would not normally require the COA number to be entered. I'm also assuming you're using the COA number that's on a label on the machine. in that case, I would guess that the disk you are using is a rertail version of XP Home and you require an OEM version. How you aquire that is up to you, but that's what the problem is.